<h3>畅销书</h3>
<mat-grid-list cols="4" rowHeight="2:1">
  <mat-grid-tile 
    *ngFor="let book of books">
    <a routerLink="/detail/{{book.id}}">{{book.name}}</a>
  </mat-grid-tile>
</mat-grid-list>
<app-book-search></app-book-search>

